Walker, A. S., Pritchard, E., House, T., Robotham, J. V., Birrell, P. J., Bell, I., Bell, J. I., Newton, J. N., Farrar, J., Diamond, I., Studley, R., Hay, J., Vihta, K.-D., Peto, T. E., Stoesser, N., Matthews, P. C., Eyre, D. W., Pouwels, K., the COVID-19 Infection Survey team